Add email integration to be able to broadcast emails to all users.

Resolves #388

app/api/src/lib/sendmail.ts

@@ -0,0 +1,56 @@
+import nodemailer, {SendMailOptions} from 'nodemailer'
+
+interface Args {
+  to: SendMailOptions['to']
+  from: SendMailOptions['from']
+  subject: string
+  text: string
+}
+
+interface SuccessResult {
+  accepted: string[]
+  rejected: string[]
+  envelopeTime: number
+  messageTime: number
+  messageSize: number
+  response: string
+  envelope: {
+    from: string | false,
+    to: string[]
+  },
+  messageId: string
+}
+
+export function sendMail({to, from, subject, text}: Args): Promise<SuccessResult> {
+  let transporter = nodemailer.createTransport({
+    host: 'smtp.mailgun.org',
+    port: 587,
+    secure: false,
+    tls: {
+      ciphers:'SSLv3'
+    },
+    auth: {
+      user: 'postmaster@mail.cadhub.xyz',
+      pass: process.env.EMAIL_PASSWORD
+    }
+  });
+
+  console.log({to, from, subject, text});
+
+  const emailPromise = new Promise((resolve, reject) => {
+    transporter.sendMail({
+      from,
+      to,
+      subject,
+      text,
+    }, (error, info) => {
+      if (error) {
+        reject(error);
+      } else {
+        resolve(info);
+      }
+    });
+  }) as any as Promise<SuccessResult>
+  return emailPromise
+}
+